KR101281246B1 - In-line manufacturing machine for wire rod having superior magnetic property and manufacturing using the same - Google Patents

Abstract

The present invention relates to an inline device for manufacturing wire rods having excellent magnetic properties and a wire rod manufacturing method using the same. It provides an inline device and a wire rod manufacturing method using the same.
The present invention for achieving the above object is composed of a chamber for raising the temperature of the wire rod, a multi-stage cooling table for cooling and a chamber for spraying the coating liquid.

Description

In-line device for manufacturing wire rod with excellent magnetic properties and wire rod manufacturing method using same {IN-LINE MANUFACTURING MACHINE FOR WIRE ROD HAVING SUPERIOR MAGNETIC PROPERTY AND MANUFACTURING USING THE SAME}

The present invention relates to an in-line device for producing a wire rod having excellent magnetic properties and a wire rod manufacturing method using the same. More specifically, the magnetic properties that can be used in transformers, automobiles, electrical and electronic products, which require low iron loss and high permeability It relates to an inline device for producing excellent wire rod and a wire rod manufacturing method using the same.

In the case of steel or steel sheets with high magnetic properties, they are used as iron cores of transformers and large generators because of their excellent magnetic properties. However, when the steel wire and the steel sheet having such high magnetic properties have magnetic anisotropy, the high magnetic properties and magnetic properties are greatly deteriorated, resulting in a decrease in value as a product.

Therefore, it is necessary to develop and research high-quality oriented electrical steel sheet while requiring more efficiency than before, and in recent years, various research and development needs for miniaturization and light weight of machinery have emerged. It is a more demanding situation.

In order to show directional high magnetic properties, it is necessary to control the texture. That is, since the crystal orientation having the magnetic induction value and the minimum iron loss is the <100> axis, a polycrystalline material having the <100> axis parallel to the rolling direction should be used. A grain-oriented electrical steel sheet requires a <100> texture and, in the non-oriented case, a texture having a <100> axis perpendicular to the rolling direction. Therefore, <100> crystal orientation control is a core technology for manufacturing electric steel wire, and efforts to develop new methods for controlling the crystal orientation are being made in advanced countries.

On the other hand, although recently improved the way to improve the magnetic properties of the electrical steel sheet by controlling the texture or surface coating of the grain-oriented electrical steel sheet, in the case of the electrical steel sheet used as a transformer, In order to suppress the slit (slit), shearing or warping, precise processing is required, and if the iron core is relatively small, there is a problem that the processing itself becomes difficult.

In order to solve this problem, a technology for manufacturing wire rods for small motors mounted on small transformers or automobiles by manufacturing electromagnetic wires or electric wires has been developed. When electrical steel sheets are made of wire rods, rolling and surface defects are suppressed. There is no need for harsh process control, and there is an advantage in that it is possible to solve the problem of yield reduction due to electrical steel lamination.

Such a representative technique is Japanese Patent Laid-Open No. 2001-115241. The patent is to manufacture a material for electronic steel wire excellent in drawing workability, in particular cold drawing workability, even in the hot rolled state (As rolled), including Si in the range of 0.1 ~ 8% of C + N + O + S A component system is proposed that limits the sum to 0.015% or less. However, in the case of the above patent, since the carbon component is controlled by ultra-low carbon, RH (Ruhrstahl-Heraues) degassing process should be added, and complex deoxidation should be performed with a long vacuum degassing time. The disadvantage is that it can't be. In addition, since Cr is added in an amount of 0.1 to 15% for magnetic fragrance, it is not possible to solve the problem of an increase in the alloying element price.

As a technology complementing the above patent, there is Japanese Patent Laid-Open No. 2000-045051. The patent relates to an electronic steel wire having excellent iron loss and workability, in which the sum of the C, N, O, and S components is limited to 0.015% or less, and the grain size and the wire diameter after wire drawing are defined. : An electronic steel wire having excellent iron loss and workability, which has added 2% or less, Al: 2% or less and Cu: 2% or less, is disclosed. However, the electronic steel wire disclosed in the patent has the disadvantage that there is no problem of the source material price increase due to the increase in the amount of alloy element added, there is no magnetic proposal in the hot rolling state, there is a disadvantage that there is no specification of the texture fraction.

On the other hand, there is another invention disclosed in Japanese Unexamined Patent Publication No. 2001-131718, the patent is limited to the sum of the C, N, O, S components to 0.025% or less, wire diameter of 0.01 ~ 1.0mm manufactured by drawing wire Presenting. However, the patent also has the disadvantage that the addition of expensive alloying elements such as Cr, Ni, Cu is essential, there is no specific organizational proposal for magnetic and the presentation of magnetic values.

In particular, in the case of the above-described patents, there is a disadvantage that all the magnetic properties have a value close to that of the non-oriented electrical steel sheet.

The present invention provides an inline device configured to sequentially perform the steel rolling, annealing, cooling and coating of the steel material, and provides a wire rod manufacturing method for manufacturing a wire rod having excellent magnetic properties using the inline device. will be.

As a means for realizing this, an inline device for producing wire rods having excellent magnetic properties according to the present invention,

A ball rolling mill for rolling the steel to the wire; A wire anneal chamber configured to heat and anneal the wire rod rolled in the ball mill; A multi-stage cooler having a plurality of coolant spray units configured to cool the wire rod annealed in the wire-anneal chamber in multiple stages; And a wire coating chamber having a coating liquid spraying zone formed to spray the coating liquid and configured to coat the wire rod cooled by the multi-stage cooler.

In addition, the wire annealing chamber is preferably provided with an induction coil for heating the wire rod and a wire holder for holding the wire rod.

Moreover, the manufacturing method of the wire rod excellent in the magnetic characteristic by this invention is a weight%, C: 0.005-0.01%, Si: 3.0-10.0%, Mn: 0.1-2.0%, Al: 0.008-0.018%, N: A heating step of heating the steel made of 0.0015 to 0.0030%, balance Fe and other unavoidable impurities at 1000 to 1100 ° C., a step of rolling the heated steel into a wire rod from a ball rolling mill, and annealing the wire rolled wire rod. Annealing in the chamber, cooling the annealed wire rod in a multi-stage cooler; And coating the wire rod by spraying a coating agent on the wire rod cooled as described above in the wire coating chamber.

In addition, the annealing step is preferably carried out for 5 to 10 minutes at 700 ~ 800 ℃ by heating the wire-rolled wire rod at a rate of 5 ~ 15 ℃ / s in the wire annealing chamber.

In addition, in the wire rod cooling step, it is preferable to cool the annealed wire rod to 150 ° C at a rate of 10 ° C / s or less.

In addition, the coating agent is preferably at least one member selected from the group consisting of MgO, Al ₂ O ₃ , ZnO and ZrO ₂ .

The present invention has an effect that can be manufactured to the wire rod having a good magnetic properties more efficiently by the continuous rolling of the steel, annealing the wire, cooling and coating sequentially.

1 is a schematic view of an inline device according to the invention.

The present invention provides an inline apparatus configured to sequentially perform the steel rolling, annealing, cooling, and coating of steel, and provides a wire rod manufacturing method using the inline apparatus.

As shown in Figure 1, the in-line device of the present invention is to make a wire having excellent magnetic properties, and after heating the steel that satisfies the various composition ranges, it is applied to the reheated steel is cold rolling, annealing, cooling and coating In order to achieve this, it is provided with a ball mill (10) for forming a steel rod by wire, a wire annealing chamber (20) configured to heat and anneal the wire rolled in the ball mill, and a plurality of cooling water spraying units (31). A multi-stage cooler 30 configured to cool the wire rod annealed in the wire anneal chamber in multiple stages and a coating liquid spraying zone 41 formed to spray the coating liquid are configured to coat the wire cooled in the multi-stage cooler. The wire coating chamber 40 is continuous.

In the mill rolling mill 10 as a wire rod, the steel mill is subjected to the milling of the reheated steel. The rolling mill is an essential process in the manufacture of the wire rod. Straining by rolling causes activation of the generation of aggregated structures involved in the magnetic properties, ie, Goss structures. As a result, it is possible to impart excellent magnetism to the wire rod even by performing the hot rolling in a hot state.

In addition, the inline device of the present invention is provided with a wire annealing chamber 20 and a plurality of cooling water spraying stations 31 configured to heat and anneal the wire rod rolled in a ball mill, and multi-stage the wire rod annealed in the wire annealing chamber. Through the multi-stage cooler 30 configured to be cooled by the annealing process is made. The annealing process is important for generating more goth tissue in the hot rolled steel sheet because the annealing process can impart a driving force to change the direction of other directional tissues around the goth tissue toward the goth tissue. It becomes a process.

In the present invention, to the wire having a variety of alloy composition, it is possible to apply a suitable annealing temperature and time to improve the magnetic properties for each wire, to be heated to 600 ~ 900 ℃ equipped with an induction coil 21 The wire rod holder 22 may be attached to the wire annealing chamber so as to be heat treated for at least one minute to up to 10 hours.

In addition, the multi-stage cooler 30 cools the heated wire to be packaged. The multi-stage cooler 30 is also preferably equipped with a cooling water spraying unit 31 to be cooled to a maximum of 100 ℃ / s, so that it can be applied to the wire rod having a variety of alloy composition, the cooling water spraying unit 31 Liquid nitrogen and a polymer solution may be used as the refrigerant to be injected from.

In the wire coating chamber 40 configured to coat the wire cooled in the multi-stage cooler, the glass coating may be formed by reacting with the surface oxide layer of the steel sheet produced during annealing through surface coating to improve interlayer insulation. Formation can prevent adhesion of sulfur which inhibits magnetic properties.

The wire coating chamber 40 may be attached with a coating liquid spraying rod 41 capable of spraying the coating liquid on the top, bottom, left and right sides so as to surface-coat one or more selected from the group consisting of MgO, Al ₂ O ₃ , ZnO, and ZrO ₂ . And it can be attached to the adjusting device to control the injection pressure so that the coating liquid can be smoothly sprayed on the entire surface.

Hereinafter, a method of manufacturing a wire rod having excellent magnetic properties using the inline device will be described in detail.

Carbon (C): 0.005-0.01 weight%

C is dissolved in the wire and causes lattice distortion and aging in processing, while reducing ductility. When the C is added at less than 0.005%, there is a problem in that it is not possible to form a uniform goth structure in the wire rod, and when it exceeds 0.01%, the content of the carbon is 0.005 because the magnetism is reduced by carbon solid solution. It is preferable to limit it to -0.01%.

Silicon (Si): 3.0-10.0 wt%

Si is an effective component to improve the iron loss and magnetism by increasing the electrical resistance of the wire rod, but if less than 3%, the magnetism is lowered due to the lack of addition amount, and if it exceeds 10%, the work hardening during the wire rod is rapidly progressed and can be rolled Since there is no disadvantage, the content of the silicon is preferably limited to 3.0 to 10.0% by weight.

Manganese (Mn): 0.1-2.0 wt%

Mn is a useful component that can improve the electrical resistance and improve the iron loss characteristics of the wire rod, but if it is added less than 0.1%, Mn can not play a role of compensating the strength when rolling, and when it exceeds 2.0%, it is processed like Si There is a problem that causes a hot rolling problem by increasing the curing effect. Therefore, the content of manganese is preferably limited to 0.1 ~ 2.0%.

Aluminum (Al): 0.008 ~ 0.018 wt%

In the case of Al, it is preferable to limit the content in conjunction with the nitrogen control range because it is an element effective for improving the magnetic properties through the control of nitrogen in the steel. When the Al is added less than 0.008% has the disadvantage that it can not effectively control the nitrogen, and when added in excess of 0.018%, Al may precipitate in an atomic state to lower the magnetism of the aluminum, The content is preferably limited to 0.008 to 0.018%.

Nitrogen (N): 0.0015 to 0.003 wt%

In the case of N, the formation of goth structure is suppressed through lattice deformation and nitride formation with alloying elements due to penetration into the crystal lattice, which causes aging and ductility deterioration. Nitrogen is controlled at less than 0.0015% because it is a very harsh process in the steelmaking process and cannot be implemented in the actual process.If it exceeds 0.003%, nitrogen in the steel can move freely and the Al content is increased to coarsen AlN. In order to make it possible, the content of nitrogen is preferably limited to 0.0015 to 0.003%.

By limiting the composition range as described above, excellent magnetic properties, that is, directivity, can be imparted to the wire rod. The wire rod manufactured by the manufacturing method of the present invention will include a Goss structure of 95 area% or more. Thus, a large amount of goth structure is generated as compared with the existing electrical steel sheet or a wire rod having magnetic properties. It has excellent magnetic properties, that is, directivity. When the goth structure is less than 95%, the wire rod cannot be provided with directionality and thus has non-directional magnetic properties.

It heats at 1000-1100 degreeC about the steel material which satisfy | fills the composition range of this invention. If the heating temperature is less than 1000 ℃ in the wire process, extracting the steel from the furnace and rough rolling causes a problem of surface defects due to severe strain increase.If it exceeds 1100 ℃, the limit and surface scale of the furnace are increased. The quality of the product is reduced.

Subsequently, the reheated steel is subjected to ball rolling. Moreover, it is preferable to have a cooling process after the said rolling, and to cool at the speed of 0.05 degrees C / s or less. When the cooling rate exceeds 0.05 ° C / s, low-temperature tissue in the tissue appears to be more likely to transform into ferrite tissue.

After the cooling step, it is preferable to perform annealing treatment, and the annealing treatment is preferably performed by heating the completed wire rod at a rate of 5 to 15 ° C./s and maintaining it at 700 to 800 ° C. for 5 to 10 minutes.

On the other hand, if the quenching rate is less than 5 ℃ / s, because of the too slow heating rate of the heat swelling during heating is low, the heat swelling rate on the tissue may be slow, if the heat rate exceeds 15 ℃ / s too fast It is possible that not enough heat can be transferred inside the tissue. In addition, when the annealing temperature is less than 700 ° C, there is a possibility that a pearlite is generated, when the annealing temperature exceeds 800 ° C, the tissue itself may be transformed into austenite. In order to implement the effect of the annealing process preferably, annealing is preferably performed for 5 to 10 minutes.

After the annealing treatment, the wire is preferably cooled to 150 ° C at a rate of 10 ° C / s or less. When the cooling rate exceeds 10 ° C / s, there is a possibility that a low temperature structure is generated due to the rapid cooling rate, by cooling to 150 ° C, wire packaging is possible.

After the annealing treatment, the surface of the wire rod may be coated with at least one member selected from the group consisting of MgO, Al ₂ O ₃ , ZnO, and ZrO _2. The materials are representative materials having insulating properties. It can react with the surface oxide layer of the steel sheet produced during annealing to form a glassy film that improves interlayer insulation and can promote the removal of sulfur that inhibits magnetism.

By using the in-line device of the present invention, it is possible to sequentially proceed with the above step of rolling the steel, annealing the wire, cooling and coating, thereby producing a wire having excellent magnetic properties more efficiently.

Hereinafter, the present invention will be described in detail with reference to Examples.

[Example]

The steel having a composition component of Table 1 below was prepared as a wire using the process conditions described in Table 2, and then surface coated with MgO. After measuring the fraction of the goose structure and the saturation magnetic flux density for the wire rod prepared above, the results are shown in Table 3 below. The annealing time during the production of the wire was 5 minutes.

division Chemical composition (% by weight) C Si Mn P S Al N Comparison 1 0.011 6.5 1.3 0.010 0.007 0.006 0.002 Comparative material 2 0.02 6.1 1.2 0.010 0.007 0.006 0.002 Comparative material 3 0.015 6.1 1.3 0.010 0.007 0.006 0.002 Comparison 4 0.017 6.3 1.03 0.010 0.007 0.006 0.002 Inventory 1 0.0068 6.0 0.985 0.010 0.007 0.011 0.002 Inventory 2 0.0071 6.1 0.996 0.010 0.007 0.01 0.002 Invention 3 0.0065 6.2 0.98 0.010 0.007 0.01 0.002 Invention 4 0.0074 8.1 1.02 0.010 0.007 0.013 0.002 Invention Article 5 0.0081 8.3 1.1 0.010 0.007 0.011 0.002 Comparative material 5 0.0041 11.02 1.3 0.010 0.007 0.02 0.002 Comparative material 6 0.003 11.4 1.3 0.010 0.007 0.021 0.002 Comparison 7 0.003 10.92 1.0 0.010 0.007 0.024 0.002 COMPARISON 8 0.003 10.75 1.1 0.010 0.007 0.02 0.002

division Heating temperature
(℃) Nominal rolling temperature
(℃) Section reduction rate
(%) Cooling rate
(° C / s) Annealing temperature
(℃) Cooling rate
(° C / s) Cooling stop temperature (℃) Comparison 1 1100 850 40 0.2 850 15 150 Comparative material 2 1100 900 50 0.2 850 15 150 Comparative material 3 1100 900 60 0.1 650 20 150 Comparison 4 1100 900 70 0.15 650 20 150 Inventory 1 1100 900 75 0.05 700 5 150 Inventory 2 1100 900 75 0.03 700 5 150 Invention 3 1100 900 80 0.03 750 10 150 Invention 4 1100 900 85 0.01 800 10 150 Invention Article 5 1100 900 85 0.01 800 10 150 Comparative material 5 1100 900 40 0.2 850 15 150 Comparative material 6 1100 900 50 0.2 850 15 150 Comparison 7 1100 900 60 0.1 650 20 150 COMPARISON 8 1100 1050 65 0.15 650 20 150

division Goth tissue fraction (area%) Saturated magnetic flux density (emu) Comparison 1 90.3 260.7 Comparative material 2 90.5 265.2 Comparative material 3 91.3 266.6 Comparison 4 91.2 266.1 Inventory 1 95.2 287.8 Inventory 2 98.2 295.5 Invention 3 96.6 281.1 Invention 4 97.7 293.3 Invention Article 5 98.1 286.5 Comparative material 5 83.2 255.1 Comparative material 6 82.2 258.3 Comparison 7 88.1 261.9 COMPARISON 8 86.1 259.5

As can be seen from Tables 1 to 3, Inventive Materials 1 to 5 satisfying the component system and the manufacturing conditions according to the present invention has a high magnetic property of 95% or more and a saturation magnetic flux density of 270emu or more. .

However, the comparative materials 1 to 8 do not satisfy the component system and manufacturing conditions proposed by the present invention, it can be seen that it has a low level of goth structure and saturation magnetic flux density, accordingly, the comparative materials 1 to 8 are magnetic properties It can be seen that this is not excellent.

10: ball rolling mill (fresh dice)
20: Wire Rod Annealing Chamber
21: Induction coil
22: wire rod holder
30: multi stage cooler
31: Cooling water jet
40: wire coating chamber
41: coating liquid spraying table

Claims (6)

delete delete 1000% steel, consisting of C: 0.005 to 0.01%, Si: 3.0 to 10.0%, Mn: 0.1 to 2.0%, Al: 0.008 to 0.018%, N: 0.0015 to 0.0030%, balance Fe and other unavoidable impurities A heating step of heating at ˜1100 ° C .;
A ball rolling step of rolling the heated steel from a ball rolling mill to a wire rod;
Annealing the wire-rolled wire rod in a wire annealing chamber;
Cooling the annealed wire rod as described above in a multi-stage cooler; And
Method of producing a wire having excellent magnetic properties comprising the step of coating the wire by spraying a coating on the wire is cooled in the wire coating chamber as described above.
The method of claim 3,
In the annealing step, the wire-rolled wire rod is heated in a wire annealing chamber at a rate of 5 to 15 ° C./s and performed at 700 to 800 ° C. for 5 to 10 minutes.
The method of claim 3,
The cooling step is a method of manufacturing a wire having excellent magnetic properties, characterized in that to cool the annealed wire to 150 ℃ at a rate of 10 ℃ / s or less.
The method of claim 3,
The coating agent is a method of manufacturing a wire having excellent magnetic properties, characterized in that at least one member selected from the group consisting of MgO, Al ₂ O ₃ , ZnO and ZrO ₂ .

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